Wise Chat <= 3.4.5 - Reflected Cross-Site Scripting via Image Preparation Endpoint
- ID
- WPSEC-2026-3134
- Plugin
- Wise Chat (wise-chat)
- Affected
- all versions before 3.4.6
- Remediation
- Update to 3.4.6 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-14
- Attack surface
- Wise Chat on WPSec AttackSurface
- Fix released
- Published
Description
The Wise Chat plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'data' parameter of the wise_chat_prepare_image_endpoint action in all versions up to, and including, 3.4.5, due to insufficient input validation and missing output escaping. The endpoint checked only that the value began with a 'data:image/gif;base64' prefix and then echoed the whole value back in a text/html response, and it had no nonce or XHR request check. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in the browser of a chat user, granted they can trick that user into submitting a forged cross-site request, for example by visiting a malicious page.
References
- https://wpsec.com/vuln/WPSEC-2026-3134/
- https://plugins.svn.wordpress.org/wise-chat/tags/3.4.6/
- https://wordpress.org/plugins/wise-chat/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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